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Synonyms for unthinkable

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  1. Inconceivable

    incredible, unbelievable, unimaginable, improbable; see unbelievable, unlikely.

  2. Impossible

    out of the question, absurd, illogical, contrary to reason, beyond the bounds of possibility.

See unthinkable in Webster's New World Roget's A-Z Thesaurus II

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